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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8d33857a72e018dd90433b2c9713de8e10d545ccab33bc1996293242e8a93a6' 
  AND token = 'rrr5rO4coyN238+he7XbPH3O0IudnK0YbnbO0ibmi4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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