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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41393f28fa8520227f8a5343873bd2f953f2d0ed6775c6c83b7464b4bc5fdbd7' 
  AND token = 'Wxbcc5IUUYEEJ4X9DB6MjC7arKVrY/J/Vj6HRFtMWAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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