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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9ffbb480d1b4bd06c9baf22bb1283dd8715110990388c510df38000a3b9389f' 
  AND token = 'jXYpws6nAu82c/TfF0qHlP7ALyItnBjIVbvQBgviEJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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