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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0abbdd44693291bbb8cd01698a14aa08f2fb4ee0d057ee1a844c9584c85dcf7' 
  AND token = 'bCbuC2aTwo5x+YU37NvZ6S4iUApIrhJPugiE9eukL6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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