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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47cdbd56d81db1d82d3e975ff8c3c70dcccd29cdc951d2a4a4a2e53a8e0798a9' 
  AND token = 'H/kIofEO2Hzr4ISKwnRbbDOngCUpX+JwqvAktkIURAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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