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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc8d065999fe267f1574a7a7f1d9a0e88306f8300bdf47339911e8eda9f1342a' 
  AND token = 'B2mxwU+Q6WM884iKVEjn73uC+L1JrS+GxpjzAitINGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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