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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cabd922c7e74cb3ad503a88563e0de066e46084e561c931e6534d2267f3ebfe' 
  AND token = 'UjtzfnQq7gzSrfMyOiCW6qdz5sHBDPkFhA1FhCqz+eM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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