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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2566eaa6ffc2d7ab85e39ae3b80d2898101911b3286e7707f9424b4c71ca165' 
  AND token = '2XWLeckzDCO8DP8LP85p2ioyU3qPRLe9WZOYL3CWJUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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