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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '113233e02b9e6e7dff71de386f40811158c7ccfa30e91a15696e66487c17e8e5' 
  AND token = 'Y9EtVrTusS7VS+t5+2hXjg7PeyR1RuJAnEs0sjv4ADk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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