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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9de808f30de37836e0430d183c4c69f93ccc454c335dc7cecd45632aa884b54' 
  AND token = '0YMF3B+bgfTj96fktbimz3vNCbVkr/KzFzmQ1qP+L/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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