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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6693557362976c1f0fbc8a080e3dc9788464bd25e43bb5e5cdeef4547d1ca0b0' 
  AND token = 'QEKKPy7932QzXT/Tocaitg8fPBI2zHIl2aFhdYWCxxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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