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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5760f6ffb3f3a1222dd942bd7e612741fbf2cd5ff08600a668f8d672133ab62' 
  AND token = 'Wirj6dPwy/v/ukk92g9vPtPtUYS6UIRnH/Car2WaMIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}