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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f35e7380be9c33b8fd5c19004b25de107e029bed8a218421e14d06d2257fa44' 
  AND token = 'KYBTl3dsto4IpxfZ1tvgaSxdao7jxfGWE0y7PF2sZGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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