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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9d259671745bb369dffdfc83463b25302275f248852da7cb4dba7c56c355cd6' 
  AND token = '3pA1x3+ioblFjwcIL0+ur80T5Z8SBLbK7T9waNCsA/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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