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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2968642f81eea988b98cf74b3c67207ec99770c82af68b9fe6ecb4206ce3a91d' 
  AND token = 'Qt37N3xGe9UX4ayXNa9ZtKKhEgB6NAAtgXbMc+Dpm70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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