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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8962b8b91965376150e6462be4d62823d0290cd1be7b9128e438aab70216c8e' 
  AND token = 'y5eCyruC9nsrLpq64/kIAYRF9B5H+zNhX7cvKVi+uvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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