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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dad8ae880d6d71ef3b85f27362111bf145f1f4677789d7baeb4f0dd7f1ad0ac6' 
  AND token = 'XFweSzG6gVNkwhz11W/vzGtzjRMmzzNGsgXoBL8vPuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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