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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3972f2a6220d983533fc3f3da729f5ac11c95285281a6f16f54fd3d114eb3715' 
  AND token = 'ZNj9s5q1Usj7Zc3nsdFFHuo4Ks/jVj9i2G51aKkoxFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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