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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '895872d5488ec8cd98ebaa4b9c26a457b89a4847759d93fc68c54098270a9117' 
  AND token = 'DD9oXHXeBlr0r8Rmtqu/H18jvpqZHlOqVnsbr57DzC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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