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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a9771de82b738b677ed4a8e7bb30fb3d2d7e7c68156449ded951296144ef4c9' 
  AND token = 'drttLBAUh5H1yDNW1cr/+9sKY+30G6Mcz7YepPHGHIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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