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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58a92a711814d5151269c0cbe209a2b8fb7af9bd8adf462fd83425561bea6866' 
  AND token = '+fHIHh3vCNKJU8Ig4Y/4dlK4sJ3jeJ53sb5yHSUIDSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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