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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59aaebc1bae2fd7dbb10b1fb8f7052845921c926da76355ac416dacf926f4ac9' 
  AND token = 'DrfohkCS8Z+IQVb2F+obynFtt4uw4gV1HbAhpAS9L9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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