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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87731ce0fead870493f52c5750e23b62e3a7dfad0cb1f40ef8e5fe1f6d33ae60' 
  AND token = 'ANXOzXseoryhb6phBDJdYK92t0XUwiUgXtiU2EHo+rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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