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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd880243cfc33c97aab59391db063d4e9b466029c9525b53130744793e743b906' 
  AND token = 'jOMByLRgxLP0cA2t5Mc2aqo3DxlFa2xl8+dSuJXwHIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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