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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '657a7d64a006a0cd02a6a67bea22a889fcb4762dbef85589a4dafdf74eaeb862' 
  AND token = 'i1zAkyKwfudfjlXmwiuHu3+Cj5bDGwVPHgCR7yEzchs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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