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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ea48dac3149239ef30c1990d0dd3b300f8bef8b8c4f3a7a8f9c3f1f02b4573b' 
  AND token = 'ua9atdvdu4EyqYrBdnjSNEe4vyBVzCg2su9qSYCKzR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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