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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0c1c527e8c386557a7a0b1c56e31ff64ccaaf7c7740d084a74c6da8ec4f813' 
  AND token = '9XNWsZbiZ7cxaEcSb3M01SsRKHjLm3POieMzVQI5iF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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