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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c791b39a3e44b50390cb8bcb05f8111cd485a1ac8390eba951c864d880138064' 
  AND token = '9T+KUbLQZQOaFIeSsYZyZsPvhF17q7VUpS3fduPizO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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