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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e711e5c58d8868909043b7cc413e019066fac84a855cde343d6f85080c355cfb' 
  AND token = '4cYpM8ZhQW4sSbw3IlDxYDqVe8S0+0Ej7xmoRV/nNT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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