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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c57d77daffceb3a5ad66de8701b4dbc797a1f327d07f1a6811cf1b492be250c' 
  AND token = '7tLVGyaICz8nXbfIyqbUaGcz3hBL3VSblQAcCEPwUPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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