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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f3b661a6f6b51587450b92dd621d1d54bb1f00ed64cb6142b44d9f6bfcff96' 
  AND token = 'xcdI51vxVVfovdD04SDhZ5IAebRD6bnuHMYZyqo1M1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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