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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb4507b21ce1859fd03f586cb42a686d62e77d51074c660cd4edc1ef93749ab9' 
  AND token = 'tehC5MvB97OQK17hKW0z5E29NjI5G7QfVVaQE7ZcUU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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