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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8656469f40eb35f5e637df0bd92980b6532426a531ff63ffce204a343ca0bf5' 
  AND token = 'U6CXf14DN7Ks3zPYhcHBpmvTJRtM13GFaQJ4kbutuFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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