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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7d9d5ef168097e6b25a4c0a85893857c3a0e1035728acd5ee8a3fc45ef77743' 
  AND token = '7kPLxWPSvy/X4rmLohejpNRqJPYZuhI5O4qWIwSFz4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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