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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6ed347476420962727155589796db646bdadbbdd423f8c3e4af4ff2379c9891' 
  AND token = '17xd2w+tc3l3kbVtso69lZdUqvCdtKpTRI7/OzoHmBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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