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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbb2da47bb920bcb12074865f757b03670604600bb2f4af1c0aa2ac5383ca860' 
  AND token = '3MPPI+e8yLD9RSBZ7vSwV279mJnLgqz9U8oDee0CsHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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