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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e409ffe62f0d36402965c7017f74fb4a50df4a437091ba6183c8b7ea3b8b80e' 
  AND token = 'rYq17yo/CIxlzLIcJzMjnVf/CE4VUCRXa/eiTH+s08o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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