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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1deff85889338a80582db87252f580dd558ae0647c58732957b61ed8466657f4' 
  AND token = 'kN9BupH76toOo2llBDVeYrg58R6Jl/LzwN62cN+HN8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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