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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '139a1d105e1d6c95d4d78e6d0c9a4d2b3557d5cb4fb2f9577601626c5a1e49d7' 
  AND token = 'LTLDjgTIpd+2t97M8qcni3WqPTr5HZ3tEAz1JEdG1vI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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