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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c9aeb7d0f3fdcef3f66f05fbd01102d4de55fb10a0d4c7deed6b11514481390' 
  AND token = 'SQlUvyAg8YmTpabGT8Jp8FRidd/tzNJ3deFr43XGQSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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