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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '699b3416d679c4ed9db74077857e38cd470560d5b280289a6b209061095eb9ae' 
  AND token = 'umDhvbQ9ag6H4Z8mwbpGLA2YgLGApU7+j6iIPEqvWbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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