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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a65db3d7c569f56b96786a8e270402c5dc2856f234ac3331c73a94bd251a768' 
  AND token = '69aaru44o+6iTRI/ygG9mnOvAII6NxmyrEPBN8bzeXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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