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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a679188b373628c6f4b06db4bedd0450291e372cffee1e94946397e9cb58fa2a' 
  AND token = 'jRCiR4ZXd7oy8g+3kgJ4K820vcELyMYzL7oyDd9AF1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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