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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17e5677d5ad0b9df049da099fd9592b1654dcb9535ee93f9a9a85fd7330c9ea0' 
  AND token = 'pQ1VQd7sh4WvnPi+whp9MtU/SNoDb1QNTnbquzO38eA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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