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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8acc3df6d2990326dee1f96513c428aa072f14a4ad3e6542ffb170a8c9dbe04c' 
  AND token = '0HrAQ/F1VgKcSlxk0pZr5x7IQ3seDxemMTt3Z5vlTu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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