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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '974221fe3e5ac9ff69921245d58fb87f326cf1735138fa7f390dc9b76604be74' 
  AND token = '0fCKO0DFtradp7DTaXTI2q2hGXn5hggTxRlSLgw4mAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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