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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9476e9dc9b0dc2d97596acc43ff943d3aecb3429f4682e5391b90673aa5c0d78' 
  AND token = 'RRhGa+k6xvI6qr69OBHrniEQq27loyJVMitFqE5hR9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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