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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19468dfd3a0d4a763519457aba3836be80b0df9e5dc7cbd5016230c7f69e71cf' 
  AND token = 'rP6nmjfn69+9uClfYK71fnvh/4ht2IjSdx43yZZbhM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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