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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1855020303b30a285e078b1af7a6b1ed156face63e2f62a6e37594b703fa0ca' 
  AND token = '/plRRk2XvhRZNBhLZG57r2t79ZWF5PdUK9Rc1x+x9ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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